Zotero

The open-source reference manager for research, with AI PDF chat via the PapersGPT plugin.

What this is

Zotero is a free, open-source reference manager used by researchers and students to collect, organize and cite sources. It has no built-in AI, but a plugin called PapersGPT lets you chat with your PDFs, summarize papers and ask questions. By pointing it at TokenMix, you can run this on Claude, GPT or DeepSeek.

Before you start

• Install Zotero from zotero.org. It runs on Windows, macOS and Linux.
• Download the PapersGPT plugin (the .xpi file) from its GitHub releases page.
• Sign up at tokenmix.ai, open the Console, go to API Keys, and create a key that starts with sk-tm-.

Install the PapersGPT plugin

1. In Zotero, open Tools, then Plugins.
2. Click the gear icon in the top right, choose Install Plugin From File, and select the .xpi file you downloaded.
3. Restart Zotero if it asks.

Connect TokenMix

1. Open PapersGPT. On macOS press Command and Enter; on Windows press Ctrl and Enter.
2. In the model list, choose Customized.
3. Fill in the three lines:
   • API endpoint: https://api.tokenmix.ai/v1/chat/completions, the full path, not just /v1
   • API Key: your sk-tm- key
   • Model: a TokenMix model id, for example claude-sonnet-4.6

Check it works

Open a PDF in your library, start a PapersGPT chat, and ask it to summarize the paper. A useful reply means it is connected to TokenMix. You can see the spend in the TokenMix Console.

Common questions

Cannot connect: the API endpoint must be the full https://api.tokenmix.ai/v1/chat/completions. A plain /v1 will not work with PapersGPT.

Which models to pick: for reading and summarizing papers, Claude Opus 4.8, Claude Sonnet 4.6 and DeepSeek V4 Pro handle long context well.